prince of death

+7: summon 7 3/8 zombies with lifelink and when a creature dies put X +1+1 counters on this creature were X is that creatures power.
-4: kill all of your opponents creatures you gain x life were X is the number creatures that died.
-20: gain 400 life summon 20 4/4 with each time this creature attacks double it's toughness and power.